Needle fob sound-reproducing machines



J. A. HUNT.

NEEDLE FOR SOUND REPRODUC-ING MACHINES.

APPLICATION FILED MAR 28,1918.

Patented Aug. 12, 1919,

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JONATHAN A. HUNT, OF SALEM, MASSACHUSETTS.

NEEDLE FOR SOUND-REPRODUCING MACHINES.

Application filed March 28, 1918.

To all whom it may concern:

Be it known that I, JONATHAN A. HUNT,

a citizen of the United States, residing at ing machines, which will give better results than the needles now ordinarily used.

My invention consists in certain novel features of construction of my improved needle for sound reproducing machines, as will be hereinafter fully described.

Referring to the drawing Figure l'is a side'elevation of a sound reproducing sound box, and a sectional view of a sound record disk, and shows my improved needle in operable position.

Fig. 2 shows, on an enlarged scale, the needle shown in Fig. 1, detached.

Fig. 3 is a section, on line 3, 3, Fig. 2, looking in the direction ofothe arrow, same figure.

Fig. 4 shows a modified construction of the needle shown in Fig. 3.

Fig. 5 shows another modified tion.

Fig. t1on.

Fig. tion.

Fig. tion.,-

Fig. tion. I

Fig. 10 shows another modified construction, and

construc- 6 shows another modified construc- 7 shows another modified construc- 8 shows another modified construc- 9 shows another modified construc- Fig. 11 shows another modified construc- Specification of Letters Patent.

Patented Aug. 12, 1919.

Serial No. 225,225.

thereof, into which the 4 extends.

I will now describe my improvements in needles.

As stated above, the object of my invention is to provide a needle which will give better results than the needles ,now ordinarily used. My improved needle is preferably made of metal, and is preferably of diamond, or oval shape in cross section for a portion, or the whole of its length, and preferably has both ends cut diagonally or inclined, to form a sharp point to enter the groove in the disk.

If preferred, one or both ends may be square across, or of a shape to furnish four corners or points for playing.

point 4 of the needle I have shown in Figs. 2, and 3, the preting up the strip, from which the needles are made, there is no waste of material, and one operation of cutting the strlp,

makes the ,two operating ends on two needles, thus" reducing the cost of production.

By this construction, each needle has a playing point at each end, one point on one edge, and the other point on the opposite I edge.

Fig. 4 shows a modified construction of the needle shown in Fig. 3, having only one slde flattened.

Fig. 5 shows another modified construction, in which the needle is of a greater thickness, with one side slightly flattened.

Fig. 6 shows another modified construction, in which the needle is of st1ll greater thickness, with one side flattened.

Fig. 7 shows another modlfied construction, in which the needle is of oval shape In cross section, with flattened'sldes.

Fig. 8 shows another modlfied construction, in which the needle is of .oval shape with curved sides.

Fig. 9 shows another modified construc- \110 tion, in which the needle is of oval shape and of less diameter, and

Fig. 10 shows another modified construction, in which the needle is of oval shape, and of still less diameter.

Fig. 11 shows another modified construction, in which the needle is of square shape in cross section.

The needles of difi'erent shapes in cross section, shown in Figs. 4 to 11 inclusive, produce an entirely new line of tones from the sound reproducing disk.

It will be understood that the detailsof construction of my improved needle may be varied if desired, and it is intended to be used in any kind of sound reproducing machine.

If preferred, the portion of the needle intermediate the ends may be round, or of other shape in cross section. The needle may be of square shape in cross section, throughout its length, or near each end.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A needle for sound reproducing machines, the lateral surface of which has two edges situated at opposite ends of the longest dimension of the cross section, said needle having a flattened surface parallel to the plane of said edges and extending the whole length of the needle.

2. A needle for sound, reproducing machines, the lateral surface of which has two edges situated at opposite ends of the longest dimension of the cross section, said needle having a flattened surface parallel to the plane of said edges and extending the whole length of the needle, the end surfaces of said needle being planes perpendicular to said flattened surface and oblique to the axis of the needle.

3. A needle for sound reproducing machines wherein the lateral surface has two edges located diametrically opposite one another, the ends of the needle being parallel planes whereby the needle has a playing point at each end, one point on one edge, and the other point on the other edge. I 4. A needle for sound reproducing machines wherein the area of the cross section is reduced by flattening one side of the needle, the flattened surface extending throughout the length of the needle, the playing point being outside of the plane of the flattened surface whereby the orientation of the needle in the machine and the tone of the needle are controlled.

5. A needle for sound reproducing machines having a cross section with two diametrically opposite vertices, the ends of the needle being parallel planes whereby said needle has two working points situated at opposite ends, and in diametrically opposite elements'of the lateral surface.

6. A needle for sound reproducing machines having a cross section, one diameter of which is longerthan the others, the cross section being symmetrical about the diameter at ri ht angles to said longest diameter, said nee le having two working points located in elements of the lateral surface at ends of the longest diameter.

7. A needle for sound reproducing machines of non-circular cross section, said needle having two working points, one located at the end of one element of the lateral surface, and the other located at the end of the diametrically opposite element of the lateral surface at the other end of the needle.

JONATHAN A. HUNT. Witnesses:

JOHN C. DEWEY, MINNA HAAS. 

